Roger Federer of Switzerland endured two rain delays and a shaky moment late in the first set Wednesday to reach the quarterfinals at the Olympics after his 7-5, 6-3 win over Denis Istomin of Uzbekistan. Serving at five-all in the first set, the top-seeded Federer faced three break points and erased them all.
Federer, competing in his fourth Olympic Games, has yet to win a career singles medal, although he and Swiss teammate Stanislas Wawrinka did win the gold in men's doubles in 2008. Federer is playing his first tournament since winning a record-tying seventh Wimbledon title just a few weeks ago at the All England Tennis Club.
Federer awaits the winner of this afternoon's match between American John Isner and Serbia's Janko Tipsarevic for his next round opponent.
Kim Clijsters won the battle of the former world number ones as the Belgian defeated Serbia's Ana Ivanovic, 6-3, 6-4, to reach the women's singles quarterfinals of the Olympics. Clijsters is playing in what may very well be the final Olympic Games of her career as she prepares to retire for a second and final time after the 2012 U.S. Open.
The four-time Grand Slam champion Clijsters, ranked 36th in the world, will face world number three Maria Sharapova or Germany's Sabine Lisicki in the last eight of women's singles action